A smooth negative shift of organic-carbon isotope ratios at an end-Permian mass extinction horizon in central pelagic Panthalassa

2010 ◽  
Vol 21 (S1) ◽  
pp. 165-166
Author(s):  
Satoshi Takahashi ◽  
Kunio Kaiho ◽  
Masahiro Oba ◽  
Takeshi Kakegawa
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Mass Extinction ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Negative Shift ◽  
Organic Carbon Isotope ◽  
Permian Mass Extinction

Organic carbon isotope ratios and paleoenvironmental implications for Holocene sediments in Lake Melville, southeastern Labrador

1987 ◽  
Vol 24 (10) ◽  
pp. 1994-2003 ◽  
Author(s):  
F. C. Tan ◽  
G. Vilks
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Sediment Cores ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Organic Carbon Isotope ◽  
Glacial Runoff ◽  
Bottom Waters ◽  
History Of ◽  
Marine Influence

Stable isotope 13C/12C ratios of organic carbon in sediments and in particulate organic carbon (POC) change from typically marine values in Groswater Bay to those of terrestrial soils in Goose Bay along an offshore–onshore transect in Hamilton Inlet, southeastern Labrator. The δ13C values in POC collected from close to the water surface change relatively little in Lake Melville, indicating that the integrity of the runoff plume is maintained as it spreads in Lake Melville. The organic carbon isotope ratios in POC collected from the near-bottom waters are similar to those of surficial sediments.Downcore δ13C values reflect paleo-oceanographic changes in Hamilton Inlet during and since deglaciation. In two sediment cores that reached sufficiently old sediments (10 000 years BP), the δ13C values change toward the bottom of the cores to values similar to those of the terrestrial organic carbon in soils, signifying greater terrestrial influence during deglaciation and during the early Holocene.According to the history of postglacial isostatic readjustment of the area, Lake Melville basin was more open to the marine waters during the early postglacial marine incursion because of deeper channels leading into Lake Melville. As a consequence, evidence for greater marine influence during that time should be found in sediment cores. The lack of evidence for the deposition of marine organic carbon brought in by the marine counterflow waters suggests a proximal glaciomarine environment in the Lake Melville basin. Glacial runoff diluted the basin waters, and it is possible that the whole inner Labrador Shelf was relatively fresh during that time.

In situ iron isotope analyses of pyrite and organic carbon isotope ratios in the Fortescue Group: Metabolic variations of a Late Archean ecosystem

2012 ◽  
Vol 212-213 ◽  
pp. 169-193 ◽  
Author(s):  
Kazumi Yoshiya ◽  
Manabu Nishizawa ◽  
Yusuke Sawaki ◽  
Yuichiro Ueno ◽  
Tsuyoshi Komiya ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Isotope Ratios ◽  
Iron Isotope ◽  
Carbon Isotope Ratios ◽  
Organic Carbon Isotope ◽  
Isotope Analyses

BULK ORGANIC CARBON ISOTOPE RATIOS FROM STONEMAN LAKE AZ AS A PROXY FOR GLACIAL-INTERGLACIAL CYCLES DURING THE QUATERNARY

2018 ◽  
Author(s):  
Christopher Oscar Bayer ◽  
◽  
Peter J. Fawcett ◽  
R. Scott Anderson ◽  
Nicu-Viorel Atudorei
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Organic Carbon Isotope

Organic carbon isotope ratios (δ 13 C) of Arctic Amerasian Continental shelf sediments

2000 ◽  
Vol 89 (3) ◽  
pp. 522-532 ◽  
Author(s):  
A. S. Naidu ◽  
L. W. Cooper ◽  
B. P. Finney ◽  
R. W. Macdonald ◽  
C. Alexander ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Continental Shelf ◽  
Carbon Isotope ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Organic Carbon Isotope ◽  
Shelf Sediments
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